DHTML control with MMC has an issue with the IE7+
IE7 & IE8 is not longer support DHTML but you can install DHTML control and
still able to use it. See:
We implement MMC snap-in and use DHTML control within that snap-in (in C++
VS 2005). The DHTML control would display correctly and user can edit the
html document but when we call get_ DocumentHTML()it would throw
I had wrote sample snap-in to show the issue. If anyone interesting I can
e-mail to you.